I've had a smartplug powerstrip on once reef for about 10 months. it's a workhorse, I also have individual smartplugs, 4 rooms each have their own 120v electric radiant heaters plugged into. I use them for the nano tanks lights and power heads. All run on wifi.
I would say I have about 15 in total. I have had 2 go bad, one because of a HOB skimmer piece of Cra... overflowed right onto the plug, ok that part was my fault should not have had the plug in that spot. The other just burned out. Once you set them, they do not need wifi to work, the timers drive on.
My house is setup with wifi light switches outdoor ring cam plus 4 other cams, I have alexa that commands everything, it's almost like being on the Enterprise, only I don't have a replicator, or holodeck, I do have one hidden door that opens on command "alexa lumos" kids love it...